CN102706931B - Biasing and non-biasing operating circuit of electrochemical gas sensor and biasing configuration circuit - Google Patents
Biasing and non-biasing operating circuit of electrochemical gas sensor and biasing configuration circuit Download PDFInfo
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- CN102706931B CN102706931B CN201210174565.2A CN201210174565A CN102706931B CN 102706931 B CN102706931 B CN 102706931B CN 201210174565 A CN201210174565 A CN 201210174565A CN 102706931 B CN102706931 B CN 102706931B
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Abstract
The invention discloses a biasing and non-biasing operating circuit of an electrochemical gas sensor and a biasing configuration circuit, relates to a gas detection technology, and aims to provide a sensor operating circuit which can adapt to a biasing operating mode and a non-biasing operating mode in order to overcome the defects of the prior art. The biasing and non-biasing operating circuit of the electrochemical gas sensor is technically characterized by comprising a sensor power supply circuit, the biasing configuration circuit and a sensor output signal extraction circuit, wherein the sensor output signal extraction circuit is used for receiving and amplifying a current signal which is output by an operating electrode of the electrochemical gas sensor; the biasing configuration circuit is provided with a first voltage output end and a second voltage output end; first voltage is supplied to the sensor power supply circuit; the sensor power supply circuit is used for transmitting the first voltage to a counter electrode of the electrochemical gas sensor; second voltage is supplied to the operating electrode of the electrochemical gas sensor; and the first voltage and the second voltage, which are output by the biasing configuration circuit, can be configured to be equal or unequal.
Description
Technical field
The present invention relates to gas detection technology, particularly a kind of bias voltage of electrochemical gas sensor and non-bias voltage adaptive circuit.
Background technology
Detecting in industry at gas, is very important some in industry to the detection of toxic gas.The advantages such as toxic gas detection is mainly realized by electrochemical gas sensor, and electrochemical gas sensor has that response speed is fast, accurately (can be used for ppm level), and good stability, quantitatively detection, favorable repeatability, antijamming capability are strong.
Electrochemical sensor is by carrying out work to the electric signal that tested gas reacts and generation is directly proportional to gas concentration.Typical electrochemical sensor is by working electrode (or sensing electrode) and electrode is formed, working electrode and to being separated by a thin electrolyte layers between electrode.When object gas enters after sensor, with working electrode generation redox reaction, generation current, detect described electric current and just can record object gas concentration.Normally work with assurance electrochemical gas sensor for the current potential of working electrode being stabilized in a particular range, people have introduced third electrode, i.e. reference electrode.
The working method of galvanochemistry class gas sensor can be divided into bias voltage working method and non-bias voltage working method.So-called bias voltage working method, refers to electrochemical gas sensor during operation, requires working electrode and to keeping certain voltage difference between electrode, so just can carry out effective detection of object gas concentration; So-called non-bias voltage work, refers to the working electrode of electrochemical gas sensor and electrode is not needed to voltage difference (current potential equates).In practice, detect feature according to different object gas, need to design different working sensor circuit, to guarantee the work of sensor normal reliable, thereby effectively detect object gas concentration.
In prior art, detect feature according to different object gas, need to design different working sensor circuit, for user, just need to buy at least two cover working sensor circuit, and select different sensor circuits according to the object gas feature detecting, so not only increased cost, work efficiency is also low.
Summary of the invention
The object of the invention is the problem for above-mentioned existence, provide a kind of can adaptive electro chemical gas bias voltage and sensor circuit and the bias arrangement circuit thereof of non-bias voltage duty.
Electrochemical gas sensor bias voltage in the present invention and non-bias voltage operating circuit are such: comprise that sensor feed circuit, bias arrangement circuit and sensor output signal extract circuit; Sensor feed circuit is for powering to electrochemical gas sensor; Described sensor output signal extracts circuit for receiving and amplify the current signal of electrochemical gas sensor working electrode output; Bias arrangement circuit is powered for the mode that configures electrochemical gas sensor, makes it be operated in bias voltage or non-bias voltage working method.
Preferably, described bias arrangement circuit has the first voltage output end and second voltage output terminal;
The first voltage output end is for providing the first voltage to sensor feed circuit; Described sensor feed circuit for by the first voltage transmission to electrochemical gas sensor to electrode;
Second voltage output terminal is for providing second voltage to the working electrode of electrochemical gas sensor; The first voltage of configurable its output of described bias arrangement circuit does not equate with second voltage or not etc.
Preferably, the second voltage output terminal of described bias arrangement circuit also provides initial voltage for extracting circuit to described sensor output signal.
Preferably, described electrochemical gas sensor also comprises reference electrode; Described sensor feed circuit comprises the first operational amplifier, the first resistance and the second resistance; The first voltage output end of bias arrangement circuit is connected with the normal phase input end of the first operational amplifier by the first resistance; One end of the second resistance is connected with the inverting input of the first operational amplifier, and the other end of the second resistance is for connecting the reference electrode of electrochemical gas sensor; The output terminal of described the first operational amplifier for connect electrochemical gas sensor to electrode.
Preferably, in the output terminal of the first operational amplifier and the second resistance, be connected to filter capacitor for being connected between one end of electrochemical gas sensor reference electrode.
Preferably, described sensor output signal extraction circuit comprises the second operational amplifier, the 3rd resistance, the 4th resistance and the 5th resistance; The second voltage output terminal of described bias arrangement circuit is connected with the normal phase input end of the second operational amplifier by the 3rd resistance; One end of described the 4th resistance is connected with the inverting input of the second operational amplifier, and the 4th resistance other end is for connecting the working electrode of electrochemical gas sensor; The inverting input of the second operational amplifier is connected with the output terminal of the second operational amplifier by the 5th resistance.
Preferably, described bias arrangement circuit comprises the first divider resistance, the second divider resistance and the 3rd divider resistance; The first divider resistance, the second divider resistance and the 3rd divider resistance are linked in sequence, and the other end of the first divider resistance is connected to direct voltage source; The other end ground connection of the 3rd divider resistance; The public linkage section of the first divider resistance and the second divider resistance is the first voltage output end of bias arrangement circuit; The public linkage section of the second divider resistance and the 3rd divider resistance is the second voltage output terminal of bias arrangement circuit; The two ends of described the second divider resistance are parallel with a switch.
Preferably, described the second divider resistance is the adjustable variable resistor of resistance.
The present invention also provides the bias arrangement circuit of electrochemical gas sensor bias voltage and non-bias voltage operating circuit, and it comprises the first divider resistance, the second divider resistance and the 3rd divider resistance; The first divider resistance, the second divider resistance and the 3rd divider resistance are linked in sequence, and the other end of the first divider resistance is connected to direct voltage source; The other end ground connection of the 3rd divider resistance; The public linkage section of the first divider resistance and the second divider resistance is the first voltage output end of bias arrangement circuit; The public linkage section of the second divider resistance and the 3rd divider resistance is the second voltage output terminal of bias arrangement circuit; Described the first voltage output end and second voltage output terminal are for powering to electrode and working electrode to electrochemical gas sensor; The two ends of described the second divider resistance are parallel with a switch.
Preferably, described the second divider resistance is the adjustable variable resistor of resistance.
In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows:
1, the present invention can compatible electrochemical gas sensor bias voltage and non-bias voltage working method, only need a set of sensor circuit just can meet the testing requirement of different target gas, greatly simplifies product design and production, provides cost savings.
2, can be bias voltage or non-bias voltage working method by sensor circuit configuration by described switch, under bias voltage working method, by adjusting the second divider resistance resistance so that the bias voltage adapting with electrochemical gas sensor to be provided, the way the present invention who changes sensor circuit with respect to prior art has effectively improved work efficiency.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is the circuit theory diagrams of a specific embodiment of the present invention.
Embodiment
Disclosed all features in this instructions, or step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing), unless narration especially all can be replaced by other equivalences or the alternative features with similar object.,, unless narration especially, each feature is an example in a series of equivalences or similar characteristics.
As shown in Figure 1, the electrochemical gas sensor bias voltage in the present invention and non-bias voltage operating circuit, comprise that sensor feed circuit, sensor output signal extract circuit and bias arrangement circuit.Wherein sensor output signal extracts circuit for receiving and amplify the current signal of electrochemical gas sensor working electrode output, and bias arrangement circuit, for controlling the power supply of electrochemical gas sensor, makes it be operated in bias voltage or non-bias voltage working method.
As Fig. 2, a specific embodiment of the present invention is: the present embodiment comprises that sensor feed circuit, sensor output signal extract circuit and bias arrangement circuit.Described electrochemical gas sensor is three-electrode structure, comprises working electrode 2, to electrode 1 and reference electrode 3.
Sensor output signal extract circuit for receive the current signal that working electrode 2 exports and is amplified after export.
Described bias arrangement circuit has the first voltage VS1 output terminal and second voltage VS2 output terminal.The first voltage VS1 output terminal is for providing the first voltage VS1 to sensor feed circuit; Described sensor feed circuit for by the first voltage VS1 be transferred to electrochemical gas sensor to electrode 1, for electrochemical gas sensor provides constant operating voltage.Second voltage VS2 output terminal is for providing second voltage VS2 to the working electrode 2 of electrochemical gas sensor.The second voltage VS2 output terminal of described bias arrangement circuit also provides initial voltage for extracting circuit to described sensor output signal, and in the time of electrochemical gas sensor non-output signal, sensor output signal extracts circuit and exports an initial value.
The first voltage VS1 of configurable its output of described bias arrangement circuit does not equate with second voltage VS2 or not etc.
Concrete, described sensor feed circuit comprises operational amplifier U3A, resistance R 13 and resistance R 12; The first voltage VS1 output terminal of bias arrangement circuit is connected with the normal phase input end of operational amplifier U3A by resistance R 13; One end of resistance R 12 is connected with the inverting input of operational amplifier U3A, and the other end of resistance R 12 is for connecting the reference electrode 3 of electrochemical gas sensor; The output terminal of described operational amplifier U3A for connect electrochemical gas sensor to electrode 1.
For stable electrical sensor of chemical gas is to the current potential on electrode, can be in the output terminal of operational amplifier U3A and resistance R 12 access filter capacitor C3 for being connected between one end of reference electrode 3 of electrochemical gas sensor, that is to say between the output terminal of operational amplifier U3A and the reference electrode of electrochemical gas sensor 3 and access filter capacitor C3.
Described sensor output signal extracts circuit and comprises operational amplifier U3B, resistance R 14, resistance R 16 and resistance R 18; The second voltage VS2 output terminal of described bias arrangement circuit is connected with the normal phase input end of operational amplifier U3B by resistance R 18; One end of described resistance R 16 is connected with the inverting input of operational amplifier U3B, and resistance R 16 other ends are for connecting the working electrode 2 of electrochemical gas sensor; The inverting input of operational amplifier U3B is connected with the output terminal of operational amplifier U3B by resistance R 14.The gas response current of electrochemical gas sensor, be that the electric current of exporting after redox reaction occurs object gas on working electrode, the resistance R of flowing through 16, resistance R 14, thus the voltage signal being directly proportional to electric current in resistance R 14, obtained, export as gas response signal.
Described bias arrangement circuit comprises divider resistance R15, divider resistance R17 and divider resistance R19; Divider resistance R15, divider resistance R17 and divider resistance R19 are linked in sequence, and wherein, one end that divider resistance R15 does not connect divider resistance R17 is connected to direct voltage source; Divider resistance R19 does not connect one end ground connection of divider resistance R17; The public linkage section of divider resistance R15 and divider resistance R17 is the first voltage VS1 output terminal of bias arrangement circuit; The public linkage section of divider resistance R17 and divider resistance R19 is the second voltage VS2 output terminal of bias arrangement circuit.
In the present embodiment, resistance R 17 can be described as again bias resistance, and the potential difference (PD) (VS1-VS2) at its two ends provides bias voltage for electrochemical gas sensor.
In the time that electrochemical gas sensor is operated in bias mode, the common composition bleeder circuit of resistance R 15, resistance R 17 and resistance R 19, obtain voltage VS1>VS2, the working electrode 2 that wherein VS2 is electrochemical gas sensor provides operating voltage, for extracting circuit, sensor output signal provides initial voltage simultaneously, be that in environment, object gas is 1 o'clock, the output voltage that sensor output signal extracts circuit is VS2.VS1 provides operating voltage to electrode for electrochemical gas sensor, i.e. sensor supply voltage, in the present embodiment by sensor feed circuit export to electrochemical sensor to electrode 1.Due to the dividing potential drop effect of resistance R 17, make VS1>VS2, make sensor to electrode voltage higher than working electrode voltage, form bias voltage (VS1-VS2), the wherein value of VS1/VS2, according to sensor self parameter, obtained by divider resistance R15, resistance R 17 and resistance R 19 configurations.Concrete can be designed to resistance R 17 the adjustable variable resistor of resistance or pot, changes the value of (VS1-VS2) by adjusting the resistance of R17, thereby provides suitable bias voltage for electrochemical gas sensor.
In the time that electrochemical gas sensor is operated in non-bias mode, VS1=VS2, the working electrode of electrochemical sensor and equal to electrode voltage value.Make VS1=VS2, can use a wire by resistance R 17 short circuits, be connected in parallel on resistance R 17 two ends by wire, or by a switch in parallel two ends in resistance R 17, when switch is closed, VS1=VS2, electrochemical gas sensor is operated under non-bias voltage working method; In the time that switch disconnects, electrochemical gas sensor is operated under bias voltage working method.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.
Claims (7)
1. electrochemical gas sensor bias voltage and a non-bias voltage operating circuit, comprises that sensor feed circuit and sensor output signal extract circuit; Sensor feed circuit is for powering to electrochemical gas sensor; Described sensor output signal extracts circuit for receiving and amplify the current signal of electrochemical gas sensor working electrode output; Described electrochemical gas sensor is three-electrode structure, comprises working electrode, to electrode and reference electrode;
It is characterized in that,
Also comprise bias arrangement circuit; Bias arrangement circuit, for configuring the power supply mode of electrochemical gas sensor, makes it be operated in bias voltage or non-bias voltage working method;
Described bias arrangement circuit has the first voltage output end and second voltage output terminal;
The first voltage output end is for providing the first voltage to sensor feed circuit; Described sensor feed circuit for by the first voltage transmission to electrochemical gas sensor to electrode;
Second voltage output terminal is for providing second voltage to the working electrode of electrochemical gas sensor; The first voltage of configurable its output of described bias arrangement circuit does not equate with second voltage or not etc.
2. a kind of electrochemical gas sensor bias voltage according to claim 1 and non-bias voltage operating circuit, is characterized in that, the second voltage output terminal of described bias arrangement circuit also provides initial voltage for extracting circuit to described sensor output signal.
3. a kind of electrochemical gas sensor bias voltage according to claim 1 and non-bias voltage operating circuit, is characterized in that, described sensor feed circuit comprises the first operational amplifier, the first resistance and the second resistance; The first voltage output end of bias arrangement circuit is connected with the normal phase input end of the first operational amplifier by the first resistance; One end of the second resistance is connected with the inverting input of the first operational amplifier, and the other end of the second resistance is for connecting the reference electrode of electrochemical gas sensor; The output terminal of described the first operational amplifier for connect electrochemical gas sensor to electrode.
4. a kind of electrochemical gas sensor bias voltage according to claim 3 and non-bias voltage operating circuit, it is characterized in that, in the output terminal of the first operational amplifier and the second resistance, be connected to filter capacitor for being connected between one end of electrochemical gas sensor reference electrode.
5. a kind of electrochemical gas sensor bias voltage according to claim 1 and non-bias voltage operating circuit, is characterized in that, described sensor output signal extracts circuit and comprises the second operational amplifier, the 3rd resistance, the 4th resistance and the 5th resistance; The second voltage output terminal of described bias arrangement circuit is connected with the normal phase input end of the second operational amplifier by the 3rd resistance; One end of described the 4th resistance is connected with the inverting input of the second operational amplifier, and the 4th resistance other end is for connecting the working electrode of electrochemical gas sensor; The inverting input of the second operational amplifier is connected with the output terminal of the second operational amplifier by the 5th resistance.
6. a kind of electrochemical gas sensor bias voltage according to claim 5 and non-bias voltage operating circuit, is characterized in that, described bias arrangement circuit comprises the first divider resistance, the second divider resistance and the 3rd divider resistance; The first divider resistance, the second divider resistance and the 3rd divider resistance are linked in sequence, and the other end of the first divider resistance is connected to direct voltage source; The other end ground connection of the 3rd divider resistance; The public linkage section of the first divider resistance and the second divider resistance is the first voltage output end of bias arrangement circuit; The public linkage section of the second divider resistance and the 3rd divider resistance is the second voltage output terminal of bias arrangement circuit; The two ends of described the second divider resistance are parallel with a switch.
7. a kind of electrochemical gas sensor bias voltage according to claim 6 and non-bias voltage operating circuit, is characterized in that, described the second divider resistance is the adjustable variable resistor of resistance.
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| CN106404859B (en) * | 2016-09-06 | 2018-10-16 | 克拉玛依宏兴石油工程技术服务股份有限公司 | A kind of oil well gas-detecting device for oil exploration |
| CN109187672B (en) * | 2018-10-23 | 2022-03-15 | 成都安可信电子股份有限公司 | Electrochemical sensor testing system and testing method |
| WO2022000313A1 (en) * | 2020-06-30 | 2022-01-06 | 浙江大学 | Constant potential circuit, blood glucose measurement circuit, and device |
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